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EVAL-ADT7468EB Datasheet(PDF) 1 Page - ON Semiconductor |
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EVAL-ADT7468EB Datasheet(HTML) 1 Page - ON Semiconductor |
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1 / 81 page  dBCool® Remote Thermal Controller and Voltage Monitor ADT7468 ©2010 SCILLC. All rights reserved. Publication Order Number: May 2010 – Rev. 3 ADT7468/D FEATURES Monitors up to 5 voltages Controls and monitors up to 4 fans High and low frequency fan drive signal 1 on-chip and 2 remote temperature sensors Series resistance cancellation on the remote channel Extended temperature measurement range, up to 191°C Dynamic TMIN control mode intelligently optimizes system acoustics Automatic fan speed control mode manages system cooling based on measured temperature Enhanced acoustic mode dramatically reduces user perception of changing fan speeds Thermal protection feature via THERM output Monitors performance impact of Intel® Pentium ® 4 processor Thermal control circuit via THERM input 2-wire, 3-wire, and 4-wire fan speed measurement Limit comparison of all monitored values Meets SMBus 2.0 electrical specifications (fully SMBus 1.1-compliant) GENERAL DESCRIPTION The ADT7468 dBCool controller is a thermal monitor and multiple PWM fan controller for noise sensitive or power sensitive applications requiring active system cooling. The ADT7468 can drive a fan using either a low or high frequency drive signal, monitor the temperature of up to two remote sensor diodes plus its own internal temperature, and measure and control the speed of up to four fans, so that they operate at the lowest possible speed for minimum acoustic noise. The automatic fan speed control loop optimizes fan speed for a given temperature. A unique, dynamic TMIN control mode enables the system thermals/acoustics to be intelligently managed. The effectiveness of the system’s thermal solution can be monitored using the THERM input. The ADT7468 also provides critical thermal protection to the system using the bidirectional THERM pin as an output to prevent system or component overheating. FUNCTIONAL BLOCK DIAGRAM INPUT SIGNAL CONDITIONING AND ANALOG MULTIPLEXER GND SERIAL BUS INTERFACE SCL SDA VALUE AND LIMIT REGISTERS LIMIT COMPARATORS INTERRUPT STATUS REGISTERS BAND GAP TEMP SENSOR VCC TO ADT7468 ADDRESS POINTER REGISTER PWM CONFIGURATION REGISTERS INTERRUPT MASKING VCC D1+ D1– D2+ D2– +5VIN THERMAL PROTECTION PERFORMANCE MONITORING PWM REGISTERS AND CONTROLLERS HF & LF PWM1 PWM2 PWM3 ACOUSTIC ENHANCEMENT CONTROL BAND GAP REFERENCE 10-BIT ADC ADT7468 AUTOMATIC FAN SPEED CONTROL DYNAMIC TMIN CONTROL FAN SPEED COUNTER TACH1 TACH2 TACH3 TACH4 ACOUSTIC ENHANCEMENT CONTROL SRC +12VIN +2.5VIN VCCP VID5 VID4 VID3 VID2 VID1 VID0 THERM SMBALERT Figure 1. |
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